diff --git a/data/api/client-server/account-data.yaml b/data/api/client-server/account-data.yaml
index 306bc3b5..f7ef13eb 100644
--- a/data/api/client-server/account-data.yaml
+++ b/data/api/client-server/account-data.yaml
@@ -75,6 +75,10 @@ paths:
           description: |-
             The access token provided is not authorized to modify this user's account 
             data.
+        405:
+          description: |-
+            This `type` of account data is controlled by the server; it cannot be
+            modified by clients.
       tags:
         - User data
     get:
@@ -174,6 +178,10 @@ paths:
           description: |-
             The access token provided is not authorized to modify this user's account 
             data.
+        405:
+          description: |-
+            This `type` of account data is controlled by the server; it cannot be
+            modified by clients.
       tags:
         - User data
     get: